Rhineland-Palatinate in the context of "Nassau Castle"

A macroregion is a geopolitical subdivision that encompasses several traditionally or politically defined regions or countries. The meaning may vary, with the common denominator being cultural, economical, historical or social similarity within a macroregion. The term is often used in the context of globalization.

• It may refer to various kinds of grouping of nation states basing on geographical proximity.
• In Romania, macroregiuni ("macroregions") are a higher-level subdivision of the country.
• Sometimes the Greater Region of Saarland-Lorraine-Luxembourg -Rhineland-Palatinate-Wallonia-French Community of Belgium- and German-speaking Community of Belgium, which has not found a specific shortcut yet, is called "the macroregion".
• Physiographic macroregions of China.
• Regions of Brazil are often referred to as "macroregions", to avoid the confusion of the common word "region".
• Bajío macroregion in the north-central Western Mexico is a clear example of the concept.

The Rhine (/raɪn/ RYNE) is one of the major rivers of Europe. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein border, then part of the Swiss-Austrian border. From Lake Constance downstream, it forms part of the Swiss-German border. After that the Rhine defines much of the Franco-German border. It then flows in a mostly northerly direction through the German Rhineland. Finally, the Rhine turns to flow predominantly west to enter the Netherlands, eventually emptying into the North Sea. It drains an area of 185,000 km.

Its name derives from the Gaulish Rēnos. There are two German states named after the river, North Rhine-Westphalia and Rhineland-Palatinate, in addition to several districts (e.g. Rhein-Sieg). The departments of Bas-Rhin and Haut-Rhin in Alsace (France) are also named after the river. Some adjacent towns are named after it, such as Rheinau, Stein am Rhein, Rheineck, Rheinfelden (Switzerland) and Rheinfelden (Germany).

The Electoral Palatinate was a constituent state of the Holy Roman Empire until it was annexed by the Electorate of Baden in 1803. From the end of the 13th century, its ruler was one of the Prince-electors who elected the Holy Roman Emperor, ranking them among the most significant secular Princes of the Holy Roman Empire.

The Palatinate consisted of a number of widely dispersed territories, ranging from the left bank of the Upper Rhine in the modern state of Rhineland-Palatinate, adjacent parts of the French regions of Alsace and Lorraine to the opposite territory on the east bank of the Rhine in present-day Hesse and Baden-Württemberg up to the Odenwald range and the southern Kraichgau region, containing the capital cities of Heidelberg and Mannheim.

The Greater Region (German: Großregion [ˈɡʁoːsʁeˌɡioːn]; French: Grande Région [ɡʁɑ̃d ʁeʒjɔ̃]; Luxembourgish: Groussregioun), formerly also known as SaarLorLux, is a euroregion of eleven regional authorities located in four European states. The term has also been applied to cooperations of several of these authorities or of their subdivisions, administrations, organisations, clubs and people. Member regions represent different political structures: Wallonia, comprising the French and German-speaking Communities of Belgium; the former Lorraine part of the French Grand Est region, including the departments Meurthe-et-Moselle, Meuse, Moselle and Vosges; the German federated states of Rhineland-Palatinate and Saarland; and the sovereign state of Luxembourg.

Saarland (German: [ˈzaːɐ̯lant] ) is a state of Germany in the southwest of the country. With an area of 2,570 km (990 sq mi) and a population of 990,509 in 2018, it is the smallest German state in area apart from the city-states of Berlin, Bremen, and Hamburg, and the smallest in population apart from Bremen. Saarbrücken is the state capital and largest city; other cities include Neunkirchen and Saarlouis. Saarland is mainly surrounded by the department of Moselle (Grand Est) in France to the west and south and the neighboring state of Rhineland-Palatinate in Germany to the north and east; it also shares a small border, about 8 kilometres (5 miles) long, with the canton of Remich in Luxembourg to the northwest.

Having long been a relatively small part of the long-contested territories along the Franco-German linguistic border, Saarland first gained specific economic and strategic importance in the nineteenth century due to the wealth of its coal deposits and the heavy industrialization that grew as a result. Saarland was first established as a distinct political entity in 1920 after World War I as the Territory of the Saar Basin, which was occupied and governed by France under a League of Nations mandate.

The Rhine-Main Metropolitan Region, often simply referred to as Frankfurt Rhine-Main, Frankfurt Rhine-Main area or Rhine-Main area (German: Rhein-Main-Gebiet, Frankfurt/Rhein-Main or FrankfurtRheinMain, abbreviated FRM), is the third-largest metropolitan region in Germany after Rhine-Ruhr and Berlin-Brandenburg, with a total population exceeding 5.9 million. The metropolitan region is located in the central-western part of Germany, and stretches over parts of three German states: Hesse, Rhineland-Palatinate, and Bavaria. The largest cities in the region are Frankfurt am Main, Wiesbaden, Mainz, Darmstadt, Offenbach, Worms, Hanau, and Aschaffenburg.

The polycentric region is named after its core city, Frankfurt, and the two rivers Rhine and Main. The Frankfurt Rhine-Main area is officially designated as a European Metropolitan region by the German Federal Ministry of Transport, Building and Urban Affairs and covers an area of roughly 13,000 square kilometers (5,000 sq mi).

Trier (/trɪər/ TREER, German: [tʁiːɐ̯] ; Luxembourgish: Tréier [ˈtʀɜɪ̯ɐ] ), formerly and traditionally known in English as Trèves (/trɛv/ TREV, French: [tʁɛv] ) and Triers (see also names in other languages), is a city on the banks of the Moselle in Germany. It lies in a valley between low vine-covered hills of red sandstone in the west of the state of Rhineland-Palatinate, near the border with Luxembourg and within the important Moselle wine region.

Founded by the Romans in the late 1st century BC as Augusta Treverorum ("The City of Augustus among the Treveri"), Trier is considered Germany's oldest city. It is also the oldest seat of a bishop north of the Alps. Trier was one of the four capitals of the Roman Empire during the Tetrarchy period in the late 3rd and early 4th centuries. In the Middle Ages, the archbishop-elector of Trier was an important prince of the Church who controlled land from the French border to the Rhine. The archbishop-elector of Trier also had great significance as one of the seven electors of the Holy Roman Empire. Because of its significance during the Roman and Holy Roman empires, several monuments and cathedrals within Trier are listed as a UNESCO World Heritage Site.

The Federal Republic of Germany is a federation and consists of sixteen partly sovereign states (German: Länder, sing. Land). Of the 16 states, 13 are so-called "area-states" (Flächenländer); in these, below the level of the state government, there is a division into local authorities (counties and county-level cities) that have their own administration. Two states, Berlin and Hamburg, are city-states, in which there is no separation between state government and local administration. The state of Bremen is a special case: the state consists of the cities of Bremen, for which the state government also serves as the municipal administration, and Bremerhaven, which has its own local administration separate from the state government. It is therefore a mixture of a city-state and an area-state.Three states, Bavaria, Saxony, and Thuringia, use the appellation Freistaat ("free state"); this title is merely stylistic and carries no legal or political significance (similar to the US states that call themselves a commonwealth).

The Federal Republic of Germany ("West Germany") was created in 1949 through the unification of the three western zones previously under American, British, and French administration in the aftermath of World War II. Initially, the states of the Federal Republic were Baden (until 1952), Bavaria (Bayern), Bremen, Hamburg, Hesse (Hessen), Lower Saxony (Niedersachsen), North Rhine-Westphalia (Nordrhein-Westfalen), Rhineland-Palatinate (Rheinland-Pfalz), Schleswig-Holstein, Württemberg-Baden (until 1952), and Württemberg-Hohenzollern (until 1952). West Berlin, while still under occupation by the Western Allies, viewed itself as part of the Federal Republic and was largely integrated and considered a de facto state. In 1952, following a referendum, Baden, Württemberg-Baden, and Württemberg-Hohenzollern merged into Baden-Württemberg. In 1957, the Saar Protectorate joined the Federal Republic as the state of Saarland.